hotspot/src/share/vm/gc/g1/g1ParScanThreadState.hpp
author tschatzl
Fri, 26 Feb 2016 13:02:30 +0100
changeset 36369 f4c151403480
parent 35492 c8c0273e6b91
child 37985 539c597ee0fa
permissions -rw-r--r--
8150629: Initializing all ParScanThreadStates causes significant unaccounted "Other" times Summary: Lazily allocate ParScanThreadStates within the worker threads instead of doing this work upfront serially. Reviewed-by: mgerdin, jmasa
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/*
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 * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_GC_G1_G1PARSCANTHREADSTATE_HPP
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#define SHARE_VM_GC_G1_G1PARSCANTHREADSTATE_HPP
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#include "gc/g1/dirtyCardQueue.hpp"
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#include "gc/g1/g1CollectedHeap.hpp"
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#include "gc/g1/g1CollectorPolicy.hpp"
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#include "gc/g1/g1OopClosures.hpp"
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#include "gc/g1/g1RemSet.hpp"
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#include "gc/g1/g1SATBCardTableModRefBS.hpp"
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#include "gc/shared/ageTable.hpp"
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#include "memory/allocation.hpp"
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#include "oops/oop.hpp"
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class G1PLABAllocator;
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class G1EvacuationRootClosures;
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class HeapRegion;
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class outputStream;
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class G1ParScanThreadState : public CHeapObj<mtGC> {
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 private:
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  G1CollectedHeap* _g1h;
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  RefToScanQueue*  _refs;
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  DirtyCardQueue   _dcq;
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  G1SATBCardTableModRefBS* _ct_bs;
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  G1EvacuationRootClosures* _closures;
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  G1PLABAllocator*  _plab_allocator;
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  AgeTable          _age_table;
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  InCSetState       _dest[InCSetState::Num];
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  // Local tenuring threshold.
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  uint              _tenuring_threshold;
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  G1ParScanClosure  _scanner;
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  int  _hash_seed;
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  uint _worker_id;
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  // Map from young-age-index (0 == not young, 1 is youngest) to
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  // surviving words. base is what we get back from the malloc call
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  size_t* _surviving_young_words_base;
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  // this points into the array, as we use the first few entries for padding
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  size_t* _surviving_young_words;
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  // Indicates whether in the last generation (old) there is no more space
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  // available for allocation.
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  bool _old_gen_is_full;
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#define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t))
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  DirtyCardQueue& dirty_card_queue()             { return _dcq;  }
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  G1SATBCardTableModRefBS* ctbs()                { return _ct_bs; }
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  InCSetState dest(InCSetState original) const {
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    assert(original.is_valid(),
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           "Original state invalid: " CSETSTATE_FORMAT, original.value());
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    assert(_dest[original.value()].is_valid_gen(),
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           "Dest state is invalid: " CSETSTATE_FORMAT, _dest[original.value()].value());
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    return _dest[original.value()];
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  }
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 public:
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  G1ParScanThreadState(G1CollectedHeap* g1h, uint worker_id, size_t young_cset_length);
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  virtual ~G1ParScanThreadState();
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  void set_ref_processor(ReferenceProcessor* rp) { _scanner.set_ref_processor(rp); }
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#ifdef ASSERT
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  bool queue_is_empty() const { return _refs->is_empty(); }
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  bool verify_ref(narrowOop* ref) const;
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  bool verify_ref(oop* ref) const;
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  bool verify_task(StarTask ref) const;
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#endif // ASSERT
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  template <class T> void do_oop_ext(T* ref);
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  template <class T> void push_on_queue(T* ref);
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  template <class T> void update_rs(HeapRegion* from, T* p, oop o) {
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    // If the new value of the field points to the same region or
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    // is the to-space, we don't need to include it in the Rset updates.
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    if (!HeapRegion::is_in_same_region(p, o) && !from->is_young()) {
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      size_t card_index = ctbs()->index_for(p);
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      // If the card hasn't been added to the buffer, do it.
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      if (ctbs()->mark_card_deferred(card_index)) {
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        dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index));
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      }
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    }
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  }
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  G1EvacuationRootClosures* closures() { return _closures; }
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  uint worker_id() { return _worker_id; }
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  // Returns the current amount of waste due to alignment or not being able to fit
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  // objects within LABs and the undo waste.
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  virtual void waste(size_t& wasted, size_t& undo_wasted);
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  size_t* surviving_young_words() {
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    // We add one to hide entry 0 which accumulates surviving words for
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    // age -1 regions (i.e. non-young ones)
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    return _surviving_young_words + 1;
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  }
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  void flush(size_t* surviving_young_words);
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 private:
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  #define G1_PARTIAL_ARRAY_MASK 0x2
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  inline bool has_partial_array_mask(oop* ref) const {
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    return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK;
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  }
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  // We never encode partial array oops as narrowOop*, so return false immediately.
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  // This allows the compiler to create optimized code when popping references from
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  // the work queue.
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  inline bool has_partial_array_mask(narrowOop* ref) const {
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    assert(((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) != G1_PARTIAL_ARRAY_MASK, "Partial array oop reference encoded as narrowOop*");
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    return false;
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  }
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  // Only implement set_partial_array_mask() for regular oops, not for narrowOops.
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  // We always encode partial arrays as regular oop, to allow the
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  // specialization for has_partial_array_mask() for narrowOops above.
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  // This means that unintentional use of this method with narrowOops are caught
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  // by the compiler.
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  inline oop* set_partial_array_mask(oop obj) const {
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    assert(((uintptr_t)(void *)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!");
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    return (oop*) ((uintptr_t)(void *)obj | G1_PARTIAL_ARRAY_MASK);
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  }
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  inline oop clear_partial_array_mask(oop* ref) const {
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    return cast_to_oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK);
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  }
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  inline void do_oop_partial_array(oop* p);
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  // This method is applied to the fields of the objects that have just been copied.
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  template <class T> inline void do_oop_evac(T* p, HeapRegion* from);
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  template <class T> inline void deal_with_reference(T* ref_to_scan);
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  inline void dispatch_reference(StarTask ref);
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  // Tries to allocate word_sz in the PLAB of the next "generation" after trying to
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  // allocate into dest. State is the original (source) cset state for the object
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  // that is allocated for. Previous_plab_refill_failed indicates whether previously
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  // a PLAB refill into "state" failed.
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  // Returns a non-NULL pointer if successful, and updates dest if required.
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  // Also determines whether we should continue to try to allocate into the various
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  // generations or just end trying to allocate.
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  HeapWord* allocate_in_next_plab(InCSetState const state,
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                                  InCSetState* dest,
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                                  size_t word_sz,
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                                  AllocationContext_t const context,
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                                  bool previous_plab_refill_failed);
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  inline InCSetState next_state(InCSetState const state, markOop const m, uint& age);
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  void report_promotion_event(InCSetState const dest_state,
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                              oop const old, size_t word_sz, uint age,
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                              HeapWord * const obj_ptr, const AllocationContext_t context) const;
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 public:
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  oop copy_to_survivor_space(InCSetState const state, oop const obj, markOop const old_mark);
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  void trim_queue();
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  inline void steal_and_trim_queue(RefToScanQueueSet *task_queues);
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  // An attempt to evacuate "obj" has failed; take necessary steps.
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  oop handle_evacuation_failure_par(oop obj, markOop m);
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};
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class G1ParScanThreadStateSet : public StackObj {
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  G1CollectedHeap* _g1h;
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  G1ParScanThreadState** _states;
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  size_t* _surviving_young_words_total;
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  size_t* _cards_scanned;
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  size_t _total_cards_scanned;
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  size_t _young_cset_length;
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  uint _n_workers;
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  bool _flushed;
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 public:
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  G1ParScanThreadStateSet(G1CollectedHeap* g1h, uint n_workers, size_t young_cset_length) :
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      _g1h(g1h),
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      _states(NEW_C_HEAP_ARRAY(G1ParScanThreadState*, n_workers, mtGC)),
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      _surviving_young_words_total(NEW_C_HEAP_ARRAY(size_t, young_cset_length, mtGC)),
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      _cards_scanned(NEW_C_HEAP_ARRAY(size_t, n_workers, mtGC)),
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      _total_cards_scanned(0),
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      _young_cset_length(young_cset_length),
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      _n_workers(n_workers),
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      _flushed(false) {
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    for (uint i = 0; i < n_workers; ++i) {
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      _states[i] = NULL;
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    }
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    memset(_surviving_young_words_total, 0, young_cset_length * sizeof(size_t));
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    memset(_cards_scanned, 0, n_workers * sizeof(size_t));
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  }
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  ~G1ParScanThreadStateSet() {
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    assert(_flushed, "thread local state from the per thread states should have been flushed");
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    FREE_C_HEAP_ARRAY(G1ParScanThreadState*, _states);
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    FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_total);
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    FREE_C_HEAP_ARRAY(size_t, _cards_scanned);
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  }
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  void flush();
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  G1ParScanThreadState* state_for_worker(uint worker_id);
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  void add_cards_scanned(uint worker_id, size_t cards_scanned);
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  size_t total_cards_scanned() const;
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  const size_t* surviving_young_words() const;
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 private:
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  G1ParScanThreadState* new_par_scan_state(uint worker_id, size_t young_cset_length);
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};
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#endif // SHARE_VM_GC_G1_G1PARSCANTHREADSTATE_HPP